:root {
  --bg: #f5f4f0;
  --card: #ffffff;
  --ink: #1d1d1f;
  --soft: #6b6b70;
  --line: #e3e1da;
  --field: #fbfaf7;
  --accent: #3b5bdb;
  --accent-ink: #ffffff;
  --good: #2b8a3e;
  --good-bg: #e6f4ea;
  --bad: #c92a2a;
  --bad-bg: #fdecec;
  --mute-bg: #eeede8;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 4px 16px rgba(0, 0, 0, 0.04);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141416;
    --card: #1d1d20;
    --ink: #ececee;
    --soft: #9a9aa2;
    --line: #2e2e33;
    --field: #17171a;
    --accent: #7b93f5;
    --accent-ink: #0f1020;
    --good: #69c47e;
    --good-bg: #183222;
    --bad: #f07777;
    --bad-bg: #3a1c1c;
    --mute-bg: #26262a;
    --shadow: none;
    color-scheme: dark;
  }
}

[hidden] { display: none !important; }
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  padding: 0 max(16px, env(safe-area-inset-left)) env(safe-area-inset-bottom);
}
main, .top, footer { max-width: 720px; margin: 0 auto; }

.top { display: flex; align-items: center; justify-content: space-between; padding: 20px 0 8px; }
h1 { font-size: 1.15rem; font-weight: 650; margin: 0; letter-spacing: -0.01em; }
h1 span { color: var(--soft); font-weight: 500; }
h2 { font-size: 1.05rem; margin: 0 0 10px; font-weight: 650; }
h3 { font-size: 1.05rem; margin: 0 0 8px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px;
  margin: 12px 0;
  box-shadow: var(--shadow);
}
.login { max-width: 380px; margin: 48px auto; }
.login form { display: grid; gap: 10px; }
.login label { font-size: 0.9rem; color: var(--soft); }

input, button { font: inherit; }
input[type="text"], input[type="password"], input[type="number"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--field);
  color: var(--ink);
  min-height: 44px;
}
input:focus-visible, button:focus-visible, a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
button {
  min-height: 44px;
  padding: 8px 16px;
  border: 1px solid transparent;
  border-radius: 10px;
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
}
button:disabled { opacity: 0.5; cursor: default; }
button.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
button.danger { background: var(--bad); color: #fff; }
button.small { min-height: 36px; padding: 4px 12px; font-size: 0.9rem; }
button.tiny { min-height: 32px; padding: 2px 10px; font-size: 0.85rem; font-weight: 500; }
a { color: var(--accent); }

.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.row.end { justify-content: flex-end; margin-top: 14px; }
.announce { display: flex; gap: 8px; }
.announce input { flex: 1; min-width: 0; }

.note { color: var(--soft); font-size: 0.9rem; min-height: 1.3em; margin: 10px 0 0; }
.note.err { color: var(--bad); }

/* a game */
.game-head { display: flex; align-items: center; gap: 10px; }
.game-head h2 { margin: 0; flex: 1; min-width: 0; overflow-wrap: anywhere; }
.pill { font-size: 0.8rem; font-weight: 600; padding: 2px 10px; border-radius: 999px; background: var(--mute-bg); color: var(--soft); }
.pill.open { background: var(--good-bg); color: var(--good); }
.pill.closed { background: var(--bad-bg); color: var(--bad); }

.switch {
  position: relative;
  width: 52px; min-height: 32px; height: 32px;
  padding: 0;
  border-radius: 999px;
  background: var(--mute-bg);
  border: 1px solid var(--line);
  flex: none;
}
.switch::after {
  content: "";
  position: absolute; top: 3px; left: 3px;
  width: 24px; height: 24px; border-radius: 50%;
  background: #fff; box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
  transition: transform 0.15s ease;
}
.switch[aria-checked="true"] { background: var(--good); border-color: var(--good); }
.switch[aria-checked="true"]::after { transform: translateX(20px); }
@media (prefers-reduced-motion: reduce) { .switch::after { transition: none; } }

.closed-msg { margin: 8px 0 0; color: var(--bad); font-size: 0.92rem; }
.unreachable { margin: 10px 0 0; color: var(--soft); font-size: 0.92rem; }

.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin: 14px 0; }
.stat { background: var(--field); border: 1px solid var(--line); border-radius: 10px; padding: 8px 10px; }
.stat b { display: block; font-size: 1.25rem; font-variant-numeric: tabular-nums; }
.stat span { color: var(--soft); font-size: 0.8rem; }
@media (max-width: 420px) { .stats { grid-template-columns: repeat(2, 1fr); } }

.cap { display: flex; gap: 8px; align-items: center; margin: 0 0 12px; }
.cap label { color: var(--soft); font-size: 0.9rem; white-space: nowrap; }
.cap input { width: 110px; flex: none; }
.cap small { color: var(--soft); }

.rooms { border-top: 1px solid var(--line); margin-top: 4px; padding-top: 4px; }
.rooms summary { cursor: pointer; padding: 10px 0; color: var(--soft); font-size: 0.92rem; min-height: 44px; display: flex; align-items: center; }
.rooms summary::-webkit-details-marker { display: none; }
.rooms summary::before { content: "▸"; margin-right: 8px; transition: transform 0.15s; }
.rooms[open] summary::before { transform: rotate(90deg); }
.room { border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; margin: 0 0 8px; background: var(--field); }
.room-head { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.code { font-family: ui-monospace, "SF Mono", Menlo, monospace; font-weight: 700; letter-spacing: 0.06em; }
.tag { font-size: 0.75rem; padding: 1px 8px; border-radius: 999px; border: 1px solid var(--line); color: var(--soft); }
.room-head .since { color: var(--soft); font-size: 0.82rem; flex: 1; }
.players { list-style: none; margin: 8px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.players li { display: flex; align-items: center; gap: 4px; padding: 2px 2px 2px 10px; border-radius: 999px; background: var(--card); border: 1px solid var(--line); font-size: 0.9rem; max-width: 100%; }
.players li .name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.players li .bot { font-size: 0.7rem; color: var(--soft); text-transform: uppercase; letter-spacing: 0.04em; }
.players li button { min-height: 28px; padding: 0 9px; background: transparent; color: var(--soft); border-radius: 999px; font-weight: 500; }
.players li button:hover { color: var(--bad); }
.empty { color: var(--soft); font-size: 0.9rem; margin: 0 0 10px; }

.game .announce { margin-top: 10px; }
.game-foot { margin-top: 12px; font-size: 0.9rem; }

.link-card { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.link-card p { margin: 4px 0 0; color: var(--soft); font-size: 0.9rem; }

dialog {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--card);
  color: var(--ink);
  padding: 18px;
  width: min(420px, calc(100vw - 32px));
}
dialog::backdrop { background: rgba(0, 0, 0, 0.4); }
dialog p { margin: 0 0 10px; color: var(--soft); }
dialog label { display: block; font-size: 0.9rem; color: var(--soft); margin: 0 0 6px; }

.toast {
  position: fixed; left: 50%; bottom: max(16px, env(safe-area-inset-bottom));
  transform: translateX(-50%);
  max-width: calc(100vw - 32px);
  background: var(--ink); color: var(--bg);
  padding: 10px 16px; border-radius: 10px; font-size: 0.92rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}
.toast.err { background: var(--bad); color: #fff; }

footer { display: flex; justify-content: space-between; color: var(--soft); font-size: 0.8rem; padding: 16px 0 28px; }